<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Demo REACT</title>
</head>
<body>
    <div id="root-master" style="height:100%;display: flex;justify-content: center;align-items: center;"></div>
</body>
</html>